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Modify the relcache to record the temp status of both local and nonlocal

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temp relations; this is no more expensive than before, now that we have
pg_class.relistemp.  Insert tests into bufmgr.c to prevent attempting
to fetch pages from nonlocal temp relations.  This provides a low-level
defense against bugs-of-omission allowing temp pages to be loaded into shared
buffers, as in the contrib/pgstattuple problem reported by Stuart Bishop.
While at it, tweak a bunch of places to use new relcache tests (instead of
expensive probes into pg_namespace) to detect local or nonlocal temp tables.
This commit is contained in:
Tom Lane
2009-03-31 22:12:48 +00:00
parent 84a059abf7
commit 948d6ec90f
14 changed files with 92 additions and 56 deletions
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4
src/backend/commands/vacuum.c
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@@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.386 2009/03/24 20:17:13 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.387 2009/03/31 22:12:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1147,7 +1147,7 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, bool do_toast, bool for_wraparound,
* warning here; it would just lead to chatter during a database-wide
* VACUUM.)
*/
if (isOtherTempNamespace(RelationGetNamespace(onerel)))
if (RELATION_IS_OTHER_TEMP(onerel))
{
relation_close(onerel, lmode);
PopActiveSnapshot();